Jan
Open-source ChatGPT alternative that runs 100% offline — local models, no cloud
4.3/ 543,544 GitHub starsC++/ElectronApache-2.0
⚡ TL;DR
What
Open-source ChatGPT alternative that runs 100% offline — local models, no cloud
Who
Privacy-conscious users, Anyone wanting offline AI chat, Non-technical users wanting local LLMs
Catch
Desktop app only
Verdict
⭐⭐⭐⭐ Essential
🎯 The Problem It Solves
You want a ChatGPT-like experience that runs entirely offline on your local machine with local LLMs. No API keys, no cloud, no data leaving your computer. Jan gives you a polished local-first AI chat with model management built in.
🔧 How It Works
Jan is a desktop app that bundles Ollama-style model management with a ChatGPT-quality UI. It automatically detects your hardware, recommends appropriate models, downloads them, and lets you chat entirely offline. Extensions system adds capabilities like RAG, web search (when online), and custom tools.
🚀 Installation & Quick Start
Installation
Download from https://jan.ai or GitHub releasesQuick Start
- Download and install Jan
- Jan auto-detects your hardware
- Download a recommended model (Llama, Mistral, etc.)
- Start chatting — 100% offline
✅ Pros
- •100% offline — no cloud
- •Best model management for local LLMs
- •Polished ChatGPT-like UI
- •Extensions system
- •Free and open-source
❌ Cons
- •Desktop app only
- •Large model downloads
- •Quality depends on local model
💬 Practitioner Verdict
"Jan is the best choice for users who want a private, offline AI chat experience. The model management and polished UI make local LLMs accessible to non-technical users."
— AI RepoIndex, Security Reviewer
📊 Specifications
- Language
- C++/Electron
- License
- Apache-2.0
- Platform
- Linux, macOS, Windows
- Kill Chain
- None
💰 Pricing Reality
Completely free (Apache-2.0). No paid tiers. 100% local, no cloud costs.
👥 Community Health
Stars43,544
Forks5,443
Contributors870
Health Score8.5/10
🏷️ Tags
Open SourceLocalSelf-Hosted